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Kelas X Matematika BS

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1. |2x – 1| = 7<br />

Alternatif Penyelesaian<br />

(2x<br />

−1) 2 = 7<br />

2<br />

4x 2 – 4x + 1 = 49<br />

4x 2 – 4x + 1 – 49 = 0<br />

4x 2 – 4x – 48 = 0<br />

x 2 – x – 12 = 0<br />

(x – 4)(x +3) = 0<br />

x = 4 atau x = -3<br />

2. |2x – 1| = |x + 3|<br />

(Dikerjakan sebagai latihan)<br />

24<br />

<strong>Kelas</strong> X SMA/MA/SMK/MAK

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